RT Journal Article SR Electronic T1 Cross-sectional study on sex differences in chronic pain patients using the DATAPAIN cohort JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 997 OP 999 DO 10.1136/rapm-2020-102385 VO 46 IS 11 A1 Sophie Waardenburg A1 Nelleke de Meij A1 Brigitte Brouwer A1 Jan van Zundert A1 Sander MJ van Kuijk YR 2021 UL http://rapm.bmj.com/content/46/11/997.abstract AB